Horns 1 or 2, how many Hz is this supposed to be?, Just got a new horn sounds like a beetle Options

[Tobra]

My horn did not work when I bought the car. Wire not connected in horn ring, and the horn seemed dead even with certain power. Had cover off, and the horn on the car is a Hella, obviously, stamped with a 335 Hz on the back. Got a new horn at Bugformance, which is dual tone, 335/400 Hz Hellamex horn, works fine, sounds like any other VW, and I am left with a question. Were dual horns an option, and wiring was there, in case you want a second one, did they come with dual tone horn, or a single tone or what? I figure I will just get a second dual tone horn, might as well be twice as loud, and it is wired already, or maybe get one that is a little different to give it a different sound, who knows anything about acoustics, or more accurately I suppose sound?